Comparison of tire sizes 165/65 R15 and 185/55 R16
165/65R15
165
Tire width 
65
Profile height 
R15
Tire diameter 
535
RPM per km 165mm107mm596mm1871mm
165
65
15
185
55
16
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 596 | 610 | +14 (+2.3%) | ||
| Width, mm | 165 | 185 | +20 (+12.1%) | ||
| Circumference, mm | 1871 | 1916 | +45 (+2.4%) | ||
| Profile height, mm | 107 | 102 | -5 (-4.7%) | ||
| RPM per km | 535 | 522 | -13 (-2.4%) | ||
| Clearance change, mm | +7 | ||||
| Result: | The diameter differs by 2.3%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 102.4 |
| Difference (km/h) | 2.4 |
Sizes for comparison of tires 165/65 R15
R15
R14 -1
R16 +1
R13 -2
R17 +2
Sizes for comparison of tires 185/55 R16
R16
R15 -1
R17 +1
R14 -2
R18 +2